A Review of Anthocyanin Extraction and Bioethanol Production from Fruit Residues

The growth in fruit consumption worldwide has generated an increase in waste. One way to value this residue and reduce future environmental problems is by using some of the available bioactive compounds. Among the compounds found in this kind of waste are cellulose, hemicellulose, soluble sugars, reducing sugars, organic acids, and polyphenols, that is, biocompounds with potential industrial applications. Conventional or unconventional extraction techniques can recover these added-value compounds, such as anthocyanins, that act as natural dyes. Other processes can be applied to this residue, such as hydrolysis and fermentation, to obtain reducing sugars and produce biofuels. In this context, this review provides information about using fruit waste through anthocyanin extraction techniques and reducing sugars in bioethanol production, considering the importance of using biorefinery integrated into constructing a circular economy.